package com.tuju.jetpackfirstdemo.utils;

import android.annotation.TargetApi;
import android.app.ActivityManager;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Environment;
import android.util.Log;
import android.widget.Toast;

import com.tuju.jetpackfirstdemo.App;
import com.tuju.jetpackfirstdemo.MainActivity;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

public class CrashHandler implements Thread.UncaughtExceptionHandler {
    private static final String TAG = "CrashHandler";
    private static final boolean DEBUG = true;

    private static final String PATH = Environment.getExternalStorageDirectory().getPath() + "/CrashTest/log/";
    private static final String FILE_NAME = "crash";
    private static final String FILE_NAME_SUFFIX = ".log";

    private static CrashHandler sInstance = new CrashHandler();
    private Thread.UncaughtExceptionHandler mDefaultCrashHandler;
    private App mContext;

    private CrashHandler() {
    }

    public static CrashHandler getInstance() {
        return sInstance;
    }

    public void init(App context) {
        mDefaultCrashHandler = Thread.getDefaultUncaughtExceptionHandler();
        Thread.setDefaultUncaughtExceptionHandler(this);
        mContext = context;
    }

    /**
     *
     * 这个是最关键的函数，当程序中有未被捕获的异常，系统将会自动调用#uncaught-Exception方法
     * thread为出现未捕获异常的线程，ex为未捕获的异常，有了这个ex，我们就可以得到异常信息 守护程序
     */
    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        try {
            //导出异常信息到SD卡中
            dumpExceptionToSDCard(ex);
            //这里可以上传异常信息到服务器，便于开发人员分析日志从而解决bug
            uploadExceptionToServer();
        } catch (IOException e) {
            e.printStackTrace();
        }

        Intent intent = new Intent(mContext.getApplicationContext(), MainActivity.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        PendingIntent restartIntent = PendingIntent.getActivity(
                mContext.getApplicationContext(), 0, intent,PendingIntent.FLAG_CANCEL_CURRENT);
        //退出程序
        AlarmManager mgr = (AlarmManager)mContext.getSystemService(Context.ALARM_SERVICE);
        mgr.set(AlarmManager.RTC, System.currentTimeMillis() + 100, restartIntent); // 1秒钟后重启应用
        exitAPP(mContext);
        android.os.Process.killProcess(android.os.Process.myPid());

//        ex.printStackTrace();
        //如果系统提供了默认的异常处理器，则交给系统去结束程序，否则就由自己结束自己
//        Log.i(TAG, "uncaughtException: " + "mDefaultCrashHandler != null? " + (mDefaultCrashHandler != null));
//        if (mDefaultCrashHandler != null){
//            Intent intent = new Intent(mContext.getApplicationContext(), MainActivity.class);
//            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//            PendingIntent restartIntent = PendingIntent.getActivity(
//                    mContext.getApplicationContext(), 0, intent,PendingIntent.FLAG_CANCEL_CURRENT);
//            //退出程序
//            AlarmManager mgr = (AlarmManager)mContext.getSystemService(Context.ALARM_SERVICE);
//            mgr.set(AlarmManager.RTC, System.currentTimeMillis() + 100, restartIntent); // 1秒钟后重启应用
//            android.os.Process.killProcess(android.os.Process.myPid());
//
////            mDefaultCrashHandler.uncaughtException(thread, ex);
//        } else{
//            Intent intent = new Intent(mContext.getApplicationContext(), MainActivity.class);
//            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//            PendingIntent restartIntent = PendingIntent.getActivity(
//                    mContext.getApplicationContext(), 0, intent,PendingIntent.FLAG_CANCEL_CURRENT);
//            //退出程序
//            AlarmManager mgr = (AlarmManager)mContext.getSystemService(Context.ALARM_SERVICE);
//            mgr.set(AlarmManager.RTC, System.currentTimeMillis() + 100, restartIntent); // 1秒钟后重启应用
////            android.os.Process.killProcess(android.os.Process.myPid());
//        }
    }

    private void dumpExceptionToSDCard(Throwable ex) throws IOException {
        //如果SD卡不存在或无法使用，则无法把异常信息写入SD卡
        if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            if (DEBUG) {
                Log.w(TAG, "sdcard unmounted, skip dump exception");
                return;
            }
        }

        File dir = new File(PATH);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        long current = System.currentTimeMillis();
        String time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new
                Date(current));
        File file = new File(PATH + FILE_NAME + time + FILE_NAME_SUFFIX);

        try {
            PrintWriter pw = new PrintWriter(new BufferedWriter(new
                    FileWriter(file)));
            pw.println(time);
            dumpPhoneInfo(pw);
            pw.println();
            ex.printStackTrace(pw);
            pw.close();
        } catch (Exception e) {
            Log.e(TAG, "dump crash info failed");
        }
    }

    private void dumpPhoneInfo(PrintWriter pw) throws PackageManager.NameNotFoundException {
        PackageManager pm = mContext.getPackageManager();
        PackageInfo pi = pm.getPackageInfo(mContext.getPackageName(),
                PackageManager.GET_ACTIVITIES);
        pw.print("App Version: ");
        pw.print(pi.versionName);
        pw.print('_');
        pw.println(pi.versionCode);

        //Android版本号
        pw.print("OS Version: ");
        pw.print(Build.VERSION.RELEASE);
        pw.print("_");
        pw.println(Build.VERSION.SDK_INT);

        //手机制造商
        pw.print("Vendor: ");
        pw.println(Build.MANUFACTURER);

        //手机型号
        pw.print("Model: ");
        pw.println(Build.MODEL);
        //CPU架构
        pw.print("CPU ABI: ");
        pw.println(Build.CPU_ABI);
    }

    private void uploadExceptionToServer() {
        //TODO Upload Exception Message To Your Web Server
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public static void exitAPP(Context context) {
        ActivityManager activityManager = (ActivityManager) context.getApplicationContext().getSystemService(Context.ACTIVITY_SERVICE);
        List<ActivityManager.AppTask> appTaskList = activityManager.getAppTasks();
        for (ActivityManager.AppTask appTask : appTaskList) {
            appTask.finishAndRemoveTask();
        }
    }

}